select.spatial function

select points spatially

select a number of points by digitizing the area they fall in

select.spatial(data, digitize = TRUE, pch = "+", rownames = FALSE)

Arguments

• data: data object of class, or extending SpatialPoints; this object knows about its x and y coordinate
• digitize: logical; if TRUE, points in a digitized polygon are selected; if FALSE, points identified by mouse clicks are selected
• pch: plotting character used for points
• rownames: logical; if FALSE, row (coordinate) numbers are returned; if TRUE and data contains a data.frame part, row.names for selected points in the data.frame are returned.

Returns

if rownames == FALSE, array with either indexes (row numbers) of points inside the digitized polygon; if rownames == TRUE, character array with corresponding row names in the data.frame part

See Also

point.in.polygon , locator , SpatialPoints-class , SpatialPointsDataFrame-class

Examples

data(meuse)
## the following command requires user interaction: left mouse
## selects points, right mouse ends digitizing
data(meuse)
coordinates(meuse) = c("x", "y")
# select.spatial(meuse)